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Ethernet is a way of connecting computers together in a local area network or LAN. It has been the most widely used method of linking computers together in LANs since the 1990s. The basic idea of its design is that multiple computers have access to it and can send data at any time.
FTP stands for File Transfer Protocol and, as the name implies, it is a way of transferring files between computers.
WiFi stands for Wireless Fidelity and is the same thing as saying WLAN which stands for "Wireless Local Area Network.